blob: 7751c92c8c57fc24b0c18e4d20a095bfa02e9ff0 [file] [log] [blame]
Herbert Xueb1d1642010-02-27 19:41:45 +00001/*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <linux/err.h>
Linus Lüssing07f8ac42014-06-07 18:26:28 +020014#include <linux/export.h>
Herbert Xueb1d1642010-02-27 19:41:45 +000015#include <linux/if_ether.h>
16#include <linux/igmp.h>
17#include <linux/jhash.h>
18#include <linux/kernel.h>
Herbert Xub1951672010-02-27 19:41:51 +000019#include <linux/log2.h>
Herbert Xueb1d1642010-02-27 19:41:45 +000020#include <linux/netdevice.h>
21#include <linux/netfilter_bridge.h>
22#include <linux/random.h>
23#include <linux/rculist.h>
24#include <linux/skbuff.h>
25#include <linux/slab.h>
26#include <linux/timer.h>
Cong Wang1c8ad5b2013-05-21 21:52:54 +000027#include <linux/inetdevice.h>
Herbert Xueb1d1642010-02-27 19:41:45 +000028#include <net/ip.h>
Eric Dumazetdfd56b82011-12-10 09:48:31 +000029#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090030#include <net/ipv6.h>
31#include <net/mld.h>
David S. Millerd4c4f072010-04-27 10:16:54 -070032#include <net/ip6_checksum.h>
Linus Lüssing3c3769e2013-09-04 02:13:39 +020033#include <net/addrconf.h>
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090034#endif
Herbert Xueb1d1642010-02-27 19:41:45 +000035
36#include "br_private.h"
37
Linus Lüssingcc0fdd82013-08-30 17:28:17 +020038static void br_multicast_start_querier(struct net_bridge *br,
Linus Lüssing90010b32014-06-07 18:26:26 +020039 struct bridge_mcast_own_query *query);
Cong Wang2ce297f2012-12-10 02:15:35 +000040unsigned int br_mdb_rehash_seq;
Herbert Xuc83b8fa2012-04-13 02:37:42 +000041
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090042static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
43{
44 if (a->proto != b->proto)
45 return 0;
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000046 if (a->vid != b->vid)
47 return 0;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090048 switch (a->proto) {
49 case htons(ETH_P_IP):
50 return a->u.ip4 == b->u.ip4;
Eric Dumazetdfd56b82011-12-10 09:48:31 +000051#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090052 case htons(ETH_P_IPV6):
53 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
54#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090055 }
56 return 0;
57}
58
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000059static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
60 __u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +000061{
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000062 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
Herbert Xueb1d1642010-02-27 19:41:45 +000063}
64
Eric Dumazetdfd56b82011-12-10 09:48:31 +000065#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090066static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000067 const struct in6_addr *ip,
68 __u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090069{
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000070 return jhash_2words(ipv6_addr_hash(ip), vid,
71 mdb->secret) & (mdb->max - 1);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090072}
73#endif
74
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090075static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
76 struct br_ip *ip)
77{
78 switch (ip->proto) {
79 case htons(ETH_P_IP):
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000080 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
Eric Dumazetdfd56b82011-12-10 09:48:31 +000081#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090082 case htons(ETH_P_IPV6):
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000083 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090084#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090085 }
86 return 0;
Herbert Xueb1d1642010-02-27 19:41:45 +000087}
88
89static struct net_bridge_mdb_entry *__br_mdb_ip_get(
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090090 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
Herbert Xueb1d1642010-02-27 19:41:45 +000091{
92 struct net_bridge_mdb_entry *mp;
Herbert Xueb1d1642010-02-27 19:41:45 +000093
Sasha Levinb67bfe02013-02-27 17:06:00 -080094 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090095 if (br_ip_equal(&mp->addr, dst))
Herbert Xueb1d1642010-02-27 19:41:45 +000096 return mp;
97 }
98
99 return NULL;
100}
101
Cong Wangcfd56752012-12-11 22:23:08 +0000102struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
103 struct br_ip *dst)
Herbert Xu7f285fa2010-07-05 14:50:08 +0000104{
105 if (!mdb)
106 return NULL;
107
108 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
109}
110
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900111static struct net_bridge_mdb_entry *br_mdb_ip4_get(
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000112 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +0000113{
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900114 struct br_ip br_dst;
Herbert Xu0821ec52010-03-15 20:38:25 -0700115
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900116 br_dst.u.ip4 = dst;
117 br_dst.proto = htons(ETH_P_IP);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000118 br_dst.vid = vid;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900119
Herbert Xu7f285fa2010-07-05 14:50:08 +0000120 return br_mdb_ip_get(mdb, &br_dst);
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900121}
122
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000123#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900124static struct net_bridge_mdb_entry *br_mdb_ip6_get(
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000125 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
126 __u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900127{
128 struct br_ip br_dst;
129
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000130 br_dst.u.ip6 = *dst;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900131 br_dst.proto = htons(ETH_P_IPV6);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000132 br_dst.vid = vid;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900133
Herbert Xu7f285fa2010-07-05 14:50:08 +0000134 return br_mdb_ip_get(mdb, &br_dst);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900135}
136#endif
137
Herbert Xueb1d1642010-02-27 19:41:45 +0000138struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
Cong Wangfbca58a2013-03-07 03:05:33 +0000139 struct sk_buff *skb, u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +0000140{
Eric Dumazete8051682010-11-15 06:38:10 +0000141 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900142 struct br_ip ip;
143
Herbert Xu7f285fa2010-07-05 14:50:08 +0000144 if (br->multicast_disabled)
Herbert Xueb1d1642010-02-27 19:41:45 +0000145 return NULL;
146
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900147 if (BR_INPUT_SKB_CB(skb)->igmp)
148 return NULL;
149
150 ip.proto = skb->protocol;
Cong Wangfbca58a2013-03-07 03:05:33 +0000151 ip.vid = vid;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900152
Herbert Xueb1d1642010-02-27 19:41:45 +0000153 switch (skb->protocol) {
154 case htons(ETH_P_IP):
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900155 ip.u.ip4 = ip_hdr(skb)->daddr;
156 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000157#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900158 case htons(ETH_P_IPV6):
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000159 ip.u.ip6 = ipv6_hdr(skb)->daddr;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900160 break;
161#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900162 default:
163 return NULL;
Herbert Xueb1d1642010-02-27 19:41:45 +0000164 }
165
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900166 return br_mdb_ip_get(mdb, &ip);
Herbert Xueb1d1642010-02-27 19:41:45 +0000167}
168
169static void br_mdb_free(struct rcu_head *head)
170{
171 struct net_bridge_mdb_htable *mdb =
172 container_of(head, struct net_bridge_mdb_htable, rcu);
173 struct net_bridge_mdb_htable *old = mdb->old;
174
175 mdb->old = NULL;
176 kfree(old->mhash);
177 kfree(old);
178}
179
180static int br_mdb_copy(struct net_bridge_mdb_htable *new,
181 struct net_bridge_mdb_htable *old,
182 int elasticity)
183{
184 struct net_bridge_mdb_entry *mp;
Herbert Xueb1d1642010-02-27 19:41:45 +0000185 int maxlen;
186 int len;
187 int i;
188
189 for (i = 0; i < old->max; i++)
Sasha Levinb67bfe02013-02-27 17:06:00 -0800190 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
Herbert Xueb1d1642010-02-27 19:41:45 +0000191 hlist_add_head(&mp->hlist[new->ver],
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900192 &new->mhash[br_ip_hash(new, &mp->addr)]);
Herbert Xueb1d1642010-02-27 19:41:45 +0000193
194 if (!elasticity)
195 return 0;
196
197 maxlen = 0;
198 for (i = 0; i < new->max; i++) {
199 len = 0;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800200 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
Herbert Xueb1d1642010-02-27 19:41:45 +0000201 len++;
202 if (len > maxlen)
203 maxlen = len;
204 }
205
206 return maxlen > elasticity ? -EINVAL : 0;
207}
208
Cong Wangcfd56752012-12-11 22:23:08 +0000209void br_multicast_free_pg(struct rcu_head *head)
Herbert Xueb1d1642010-02-27 19:41:45 +0000210{
211 struct net_bridge_port_group *p =
212 container_of(head, struct net_bridge_port_group, rcu);
213
214 kfree(p);
215}
216
217static void br_multicast_free_group(struct rcu_head *head)
218{
219 struct net_bridge_mdb_entry *mp =
220 container_of(head, struct net_bridge_mdb_entry, rcu);
221
222 kfree(mp);
223}
224
225static void br_multicast_group_expired(unsigned long data)
226{
227 struct net_bridge_mdb_entry *mp = (void *)data;
228 struct net_bridge *br = mp->br;
229 struct net_bridge_mdb_htable *mdb;
230
231 spin_lock(&br->multicast_lock);
232 if (!netif_running(br->dev) || timer_pending(&mp->timer))
233 goto out;
234
Herbert Xu8a870172011-02-12 01:05:42 -0800235 mp->mglist = false;
Herbert Xueb1d1642010-02-27 19:41:45 +0000236
237 if (mp->ports)
238 goto out;
239
Eric Dumazete8051682010-11-15 06:38:10 +0000240 mdb = mlock_dereference(br->mdb, br);
241
Herbert Xueb1d1642010-02-27 19:41:45 +0000242 hlist_del_rcu(&mp->hlist[mdb->ver]);
243 mdb->size--;
244
Herbert Xueb1d1642010-02-27 19:41:45 +0000245 call_rcu_bh(&mp->rcu, br_multicast_free_group);
246
247out:
248 spin_unlock(&br->multicast_lock);
249}
250
251static void br_multicast_del_pg(struct net_bridge *br,
252 struct net_bridge_port_group *pg)
253{
Eric Dumazete8051682010-11-15 06:38:10 +0000254 struct net_bridge_mdb_htable *mdb;
Herbert Xueb1d1642010-02-27 19:41:45 +0000255 struct net_bridge_mdb_entry *mp;
256 struct net_bridge_port_group *p;
Eric Dumazete8051682010-11-15 06:38:10 +0000257 struct net_bridge_port_group __rcu **pp;
258
259 mdb = mlock_dereference(br->mdb, br);
Herbert Xueb1d1642010-02-27 19:41:45 +0000260
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900261 mp = br_mdb_ip_get(mdb, &pg->addr);
Herbert Xueb1d1642010-02-27 19:41:45 +0000262 if (WARN_ON(!mp))
263 return;
264
Eric Dumazete8051682010-11-15 06:38:10 +0000265 for (pp = &mp->ports;
266 (p = mlock_dereference(*pp, br)) != NULL;
267 pp = &p->next) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000268 if (p != pg)
269 continue;
270
stephen hemminger83f6a742010-04-27 15:01:06 +0000271 rcu_assign_pointer(*pp, p->next);
Herbert Xueb1d1642010-02-27 19:41:45 +0000272 hlist_del_init(&p->mglist);
273 del_timer(&p->timer);
Herbert Xueb1d1642010-02-27 19:41:45 +0000274 call_rcu_bh(&p->rcu, br_multicast_free_pg);
275
Linus Lüssing454594f2013-10-20 00:58:57 +0200276 if (!mp->ports && !mp->mglist &&
Herbert Xueb1d1642010-02-27 19:41:45 +0000277 netif_running(br->dev))
278 mod_timer(&mp->timer, jiffies);
279
280 return;
281 }
282
283 WARN_ON(1);
284}
285
286static void br_multicast_port_group_expired(unsigned long data)
287{
288 struct net_bridge_port_group *pg = (void *)data;
289 struct net_bridge *br = pg->port->br;
290
291 spin_lock(&br->multicast_lock);
292 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
Amerigo Wangccb1c312012-12-14 22:09:51 +0000293 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
Herbert Xueb1d1642010-02-27 19:41:45 +0000294 goto out;
295
296 br_multicast_del_pg(br, pg);
297
298out:
299 spin_unlock(&br->multicast_lock);
300}
301
Eric Dumazete8051682010-11-15 06:38:10 +0000302static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
Herbert Xueb1d1642010-02-27 19:41:45 +0000303 int elasticity)
304{
Eric Dumazete8051682010-11-15 06:38:10 +0000305 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
Herbert Xueb1d1642010-02-27 19:41:45 +0000306 struct net_bridge_mdb_htable *mdb;
307 int err;
308
309 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
310 if (!mdb)
311 return -ENOMEM;
312
313 mdb->max = max;
314 mdb->old = old;
315
316 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
317 if (!mdb->mhash) {
318 kfree(mdb);
319 return -ENOMEM;
320 }
321
322 mdb->size = old ? old->size : 0;
323 mdb->ver = old ? old->ver ^ 1 : 0;
324
325 if (!old || elasticity)
326 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
327 else
328 mdb->secret = old->secret;
329
330 if (!old)
331 goto out;
332
333 err = br_mdb_copy(mdb, old, elasticity);
334 if (err) {
335 kfree(mdb->mhash);
336 kfree(mdb);
337 return err;
338 }
339
Cong Wang2ce297f2012-12-10 02:15:35 +0000340 br_mdb_rehash_seq++;
Herbert Xueb1d1642010-02-27 19:41:45 +0000341 call_rcu_bh(&mdb->rcu, br_mdb_free);
342
343out:
344 rcu_assign_pointer(*mdbp, mdb);
345
346 return 0;
347}
348
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900349static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
350 __be32 group)
Herbert Xueb1d1642010-02-27 19:41:45 +0000351{
352 struct sk_buff *skb;
353 struct igmphdr *ih;
354 struct ethhdr *eth;
355 struct iphdr *iph;
356
357 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
358 sizeof(*ih) + 4);
359 if (!skb)
360 goto out;
361
362 skb->protocol = htons(ETH_P_IP);
363
364 skb_reset_mac_header(skb);
365 eth = eth_hdr(skb);
366
Joe Perchese5a727f2014-02-23 00:05:25 -0800367 ether_addr_copy(eth->h_source, br->dev->dev_addr);
Herbert Xueb1d1642010-02-27 19:41:45 +0000368 eth->h_dest[0] = 1;
369 eth->h_dest[1] = 0;
370 eth->h_dest[2] = 0x5e;
371 eth->h_dest[3] = 0;
372 eth->h_dest[4] = 0;
373 eth->h_dest[5] = 1;
374 eth->h_proto = htons(ETH_P_IP);
375 skb_put(skb, sizeof(*eth));
376
377 skb_set_network_header(skb, skb->len);
378 iph = ip_hdr(skb);
379
380 iph->version = 4;
381 iph->ihl = 6;
382 iph->tos = 0xc0;
383 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
384 iph->id = 0;
385 iph->frag_off = htons(IP_DF);
386 iph->ttl = 1;
387 iph->protocol = IPPROTO_IGMP;
Cong Wang1c8ad5b2013-05-21 21:52:54 +0000388 iph->saddr = br->multicast_query_use_ifaddr ?
389 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
Herbert Xueb1d1642010-02-27 19:41:45 +0000390 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
391 ((u8 *)&iph[1])[0] = IPOPT_RA;
392 ((u8 *)&iph[1])[1] = 4;
393 ((u8 *)&iph[1])[2] = 0;
394 ((u8 *)&iph[1])[3] = 0;
395 ip_send_check(iph);
396 skb_put(skb, 24);
397
398 skb_set_transport_header(skb, skb->len);
399 ih = igmp_hdr(skb);
400 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
401 ih->code = (group ? br->multicast_last_member_interval :
402 br->multicast_query_response_interval) /
403 (HZ / IGMP_TIMER_SCALE);
404 ih->group = group;
405 ih->csum = 0;
406 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
407 skb_put(skb, sizeof(*ih));
408
409 __skb_pull(skb, sizeof(*eth));
410
411out:
412 return skb;
413}
414
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000415#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900416static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000417 const struct in6_addr *group)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900418{
419 struct sk_buff *skb;
420 struct ipv6hdr *ip6h;
421 struct mld_msg *mldq;
422 struct ethhdr *eth;
423 u8 *hopopt;
424 unsigned long interval;
425
426 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
427 8 + sizeof(*mldq));
428 if (!skb)
429 goto out;
430
431 skb->protocol = htons(ETH_P_IPV6);
432
433 /* Ethernet header */
434 skb_reset_mac_header(skb);
435 eth = eth_hdr(skb);
436
Joe Perchese5a727f2014-02-23 00:05:25 -0800437 ether_addr_copy(eth->h_source, br->dev->dev_addr);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900438 eth->h_proto = htons(ETH_P_IPV6);
439 skb_put(skb, sizeof(*eth));
440
441 /* IPv6 header + HbH option */
442 skb_set_network_header(skb, skb->len);
443 ip6h = ipv6_hdr(skb);
444
445 *(__force __be32 *)ip6h = htonl(0x60000000);
David Stevens76d66152010-12-14 08:42:16 +0000446 ip6h->payload_len = htons(8 + sizeof(*mldq));
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900447 ip6h->nexthdr = IPPROTO_HOPOPTS;
448 ip6h->hop_limit = 1;
Linus Lüssinga7bff752011-03-22 11:40:32 +0000449 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
Ulrich Weberd1d81d42012-03-05 04:52:44 +0000450 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
451 &ip6h->saddr)) {
452 kfree_skb(skb);
453 return NULL;
454 }
Linus Lüssing36cff5a2011-02-17 08:17:51 +0000455 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900456
457 hopopt = (u8 *)(ip6h + 1);
458 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
459 hopopt[1] = 0; /* length of HbH */
460 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
461 hopopt[3] = 2; /* Length of RA Option */
462 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
463 hopopt[5] = 0;
Eldad Zack1de5a712012-05-17 06:00:25 +0000464 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
465 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900466
467 skb_put(skb, sizeof(*ip6h) + 8);
468
469 /* ICMPv6 */
470 skb_set_transport_header(skb, skb->len);
471 mldq = (struct mld_msg *) icmp6_hdr(skb);
472
Linus Lüssing32de8682013-06-16 23:20:34 +0200473 interval = ipv6_addr_any(group) ?
474 br->multicast_query_response_interval :
475 br->multicast_last_member_interval;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900476
477 mldq->mld_type = ICMPV6_MGM_QUERY;
478 mldq->mld_code = 0;
479 mldq->mld_cksum = 0;
480 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
481 mldq->mld_reserved = 0;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000482 mldq->mld_mca = *group;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900483
484 /* checksum */
485 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
486 sizeof(*mldq), IPPROTO_ICMPV6,
487 csum_partial(mldq,
488 sizeof(*mldq), 0));
489 skb_put(skb, sizeof(*mldq));
490
491 __skb_pull(skb, sizeof(*eth));
492
493out:
494 return skb;
495}
496#endif
497
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900498static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
499 struct br_ip *addr)
500{
501 switch (addr->proto) {
502 case htons(ETH_P_IP):
503 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000504#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900505 case htons(ETH_P_IPV6):
506 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
507#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900508 }
509 return NULL;
510}
511
Herbert Xueb1d1642010-02-27 19:41:45 +0000512static struct net_bridge_mdb_entry *br_multicast_get_group(
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900513 struct net_bridge *br, struct net_bridge_port *port,
514 struct br_ip *group, int hash)
Herbert Xueb1d1642010-02-27 19:41:45 +0000515{
Eric Dumazete8051682010-11-15 06:38:10 +0000516 struct net_bridge_mdb_htable *mdb;
Herbert Xueb1d1642010-02-27 19:41:45 +0000517 struct net_bridge_mdb_entry *mp;
Eric Dumazet95c96172012-04-15 05:58:06 +0000518 unsigned int count = 0;
519 unsigned int max;
Herbert Xueb1d1642010-02-27 19:41:45 +0000520 int elasticity;
521 int err;
522
Eric Dumazete8051682010-11-15 06:38:10 +0000523 mdb = rcu_dereference_protected(br->mdb, 1);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800524 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000525 count++;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900526 if (unlikely(br_ip_equal(group, &mp->addr)))
Herbert Xueb1d1642010-02-27 19:41:45 +0000527 return mp;
Herbert Xueb1d1642010-02-27 19:41:45 +0000528 }
529
530 elasticity = 0;
531 max = mdb->max;
532
533 if (unlikely(count > br->hash_elasticity && count)) {
534 if (net_ratelimit())
stephen hemminger28a16c92010-05-10 09:31:09 +0000535 br_info(br, "Multicast hash table "
536 "chain limit reached: %s\n",
537 port ? port->dev->name : br->dev->name);
Herbert Xueb1d1642010-02-27 19:41:45 +0000538
539 elasticity = br->hash_elasticity;
540 }
541
542 if (mdb->size >= max) {
543 max *= 2;
Thomas Graf036be6d2012-07-10 22:29:19 +0000544 if (unlikely(max > br->hash_max)) {
545 br_warn(br, "Multicast hash table maximum of %d "
546 "reached, disabling snooping: %s\n",
547 br->hash_max,
548 port ? port->dev->name : br->dev->name);
Herbert Xueb1d1642010-02-27 19:41:45 +0000549 err = -E2BIG;
550disable:
551 br->multicast_disabled = 1;
552 goto err;
553 }
554 }
555
556 if (max > mdb->max || elasticity) {
557 if (mdb->old) {
558 if (net_ratelimit())
stephen hemminger28a16c92010-05-10 09:31:09 +0000559 br_info(br, "Multicast hash table "
560 "on fire: %s\n",
561 port ? port->dev->name : br->dev->name);
Herbert Xueb1d1642010-02-27 19:41:45 +0000562 err = -EEXIST;
563 goto err;
564 }
565
566 err = br_mdb_rehash(&br->mdb, max, elasticity);
567 if (err) {
stephen hemminger28a16c92010-05-10 09:31:09 +0000568 br_warn(br, "Cannot rehash multicast "
569 "hash table, disabling snooping: %s, %d, %d\n",
570 port ? port->dev->name : br->dev->name,
571 mdb->size, err);
Herbert Xueb1d1642010-02-27 19:41:45 +0000572 goto disable;
573 }
574
575 err = -EAGAIN;
576 goto err;
577 }
578
579 return NULL;
580
581err:
582 mp = ERR_PTR(err);
583 return mp;
584}
585
Cong Wangcfd56752012-12-11 22:23:08 +0000586struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
587 struct net_bridge_port *port, struct br_ip *group)
Herbert Xueb1d1642010-02-27 19:41:45 +0000588{
Eric Dumazete8051682010-11-15 06:38:10 +0000589 struct net_bridge_mdb_htable *mdb;
Herbert Xueb1d1642010-02-27 19:41:45 +0000590 struct net_bridge_mdb_entry *mp;
591 int hash;
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000592 int err;
Herbert Xueb1d1642010-02-27 19:41:45 +0000593
Eric Dumazete8051682010-11-15 06:38:10 +0000594 mdb = rcu_dereference_protected(br->mdb, 1);
Herbert Xueb1d1642010-02-27 19:41:45 +0000595 if (!mdb) {
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000596 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
597 if (err)
598 return ERR_PTR(err);
Herbert Xueb1d1642010-02-27 19:41:45 +0000599 goto rehash;
600 }
601
602 hash = br_ip_hash(mdb, group);
603 mp = br_multicast_get_group(br, port, group, hash);
604 switch (PTR_ERR(mp)) {
605 case 0:
606 break;
607
608 case -EAGAIN:
609rehash:
Eric Dumazete8051682010-11-15 06:38:10 +0000610 mdb = rcu_dereference_protected(br->mdb, 1);
Herbert Xueb1d1642010-02-27 19:41:45 +0000611 hash = br_ip_hash(mdb, group);
612 break;
613
614 default:
615 goto out;
616 }
617
618 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
619 if (unlikely(!mp))
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000620 return ERR_PTR(-ENOMEM);
Herbert Xueb1d1642010-02-27 19:41:45 +0000621
622 mp->br = br;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900623 mp->addr = *group;
Eric Dumazet1faabf22013-07-19 20:07:16 -0700624 setup_timer(&mp->timer, br_multicast_group_expired,
625 (unsigned long)mp);
626
Herbert Xueb1d1642010-02-27 19:41:45 +0000627 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
628 mdb->size++;
629
630out:
631 return mp;
632}
633
Cong Wangcfd56752012-12-11 22:23:08 +0000634struct net_bridge_port_group *br_multicast_new_port_group(
635 struct net_bridge_port *port,
636 struct br_ip *group,
Amerigo Wangccb1c312012-12-14 22:09:51 +0000637 struct net_bridge_port_group __rcu *next,
638 unsigned char state)
Cong Wangcfd56752012-12-11 22:23:08 +0000639{
640 struct net_bridge_port_group *p;
641
642 p = kzalloc(sizeof(*p), GFP_ATOMIC);
643 if (unlikely(!p))
644 return NULL;
645
646 p->addr = *group;
647 p->port = port;
Amerigo Wangccb1c312012-12-14 22:09:51 +0000648 p->state = state;
stephen hemmingereca2a432012-12-13 06:51:28 +0000649 rcu_assign_pointer(p->next, next);
Cong Wangcfd56752012-12-11 22:23:08 +0000650 hlist_add_head(&p->mglist, &port->mglist);
651 setup_timer(&p->timer, br_multicast_port_group_expired,
652 (unsigned long)p);
653 return p;
654}
655
Herbert Xueb1d1642010-02-27 19:41:45 +0000656static int br_multicast_add_group(struct net_bridge *br,
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900657 struct net_bridge_port *port,
658 struct br_ip *group)
Herbert Xueb1d1642010-02-27 19:41:45 +0000659{
660 struct net_bridge_mdb_entry *mp;
661 struct net_bridge_port_group *p;
Eric Dumazete8051682010-11-15 06:38:10 +0000662 struct net_bridge_port_group __rcu **pp;
Linus Lüssing454594f2013-10-20 00:58:57 +0200663 unsigned long now = jiffies;
Herbert Xueb1d1642010-02-27 19:41:45 +0000664 int err;
665
Herbert Xueb1d1642010-02-27 19:41:45 +0000666 spin_lock(&br->multicast_lock);
667 if (!netif_running(br->dev) ||
668 (port && port->state == BR_STATE_DISABLED))
669 goto out;
670
671 mp = br_multicast_new_group(br, port, group);
672 err = PTR_ERR(mp);
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000673 if (IS_ERR(mp))
Herbert Xueb1d1642010-02-27 19:41:45 +0000674 goto err;
675
676 if (!port) {
Herbert Xu8a870172011-02-12 01:05:42 -0800677 mp->mglist = true;
Linus Lüssing454594f2013-10-20 00:58:57 +0200678 mod_timer(&mp->timer, now + br->multicast_membership_interval);
Herbert Xueb1d1642010-02-27 19:41:45 +0000679 goto out;
680 }
681
Eric Dumazete8051682010-11-15 06:38:10 +0000682 for (pp = &mp->ports;
683 (p = mlock_dereference(*pp, br)) != NULL;
684 pp = &p->next) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000685 if (p->port == port)
Linus Lüssing454594f2013-10-20 00:58:57 +0200686 goto found;
Herbert Xueb1d1642010-02-27 19:41:45 +0000687 if ((unsigned long)p->port < (unsigned long)port)
688 break;
689 }
690
Amerigo Wangccb1c312012-12-14 22:09:51 +0000691 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
Herbert Xueb1d1642010-02-27 19:41:45 +0000692 if (unlikely(!p))
693 goto err;
Herbert Xueb1d1642010-02-27 19:41:45 +0000694 rcu_assign_pointer(*pp, p);
Cong Wang37a393b2012-12-11 22:23:07 +0000695 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
Herbert Xueb1d1642010-02-27 19:41:45 +0000696
Linus Lüssing454594f2013-10-20 00:58:57 +0200697found:
698 mod_timer(&p->timer, now + br->multicast_membership_interval);
Herbert Xueb1d1642010-02-27 19:41:45 +0000699out:
700 err = 0;
701
702err:
703 spin_unlock(&br->multicast_lock);
704 return err;
705}
706
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900707static int br_ip4_multicast_add_group(struct net_bridge *br,
708 struct net_bridge_port *port,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000709 __be32 group,
710 __u16 vid)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900711{
712 struct br_ip br_group;
713
714 if (ipv4_is_local_multicast(group))
715 return 0;
716
717 br_group.u.ip4 = group;
718 br_group.proto = htons(ETH_P_IP);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000719 br_group.vid = vid;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900720
721 return br_multicast_add_group(br, port, &br_group);
722}
723
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000724#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900725static int br_ip6_multicast_add_group(struct net_bridge *br,
726 struct net_bridge_port *port,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000727 const struct in6_addr *group,
728 __u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900729{
730 struct br_ip br_group;
731
Linus Lüssing3c3769e2013-09-04 02:13:39 +0200732 if (ipv6_addr_is_ll_all_nodes(group))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900733 return 0;
734
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000735 br_group.u.ip6 = *group;
Linus Lüssing9cc6e0c2011-02-15 13:19:17 +0000736 br_group.proto = htons(ETH_P_IPV6);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000737 br_group.vid = vid;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900738
739 return br_multicast_add_group(br, port, &br_group);
740}
741#endif
742
Herbert Xueb1d1642010-02-27 19:41:45 +0000743static void br_multicast_router_expired(unsigned long data)
744{
745 struct net_bridge_port *port = (void *)data;
746 struct net_bridge *br = port->br;
747
748 spin_lock(&br->multicast_lock);
749 if (port->multicast_router != 1 ||
750 timer_pending(&port->multicast_router_timer) ||
751 hlist_unhashed(&port->rlist))
752 goto out;
753
754 hlist_del_init_rcu(&port->rlist);
755
756out:
757 spin_unlock(&br->multicast_lock);
758}
759
760static void br_multicast_local_router_expired(unsigned long data)
761{
762}
763
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200764static void br_multicast_querier_expired(struct net_bridge *br,
Linus Lüssing90010b32014-06-07 18:26:26 +0200765 struct bridge_mcast_own_query *query)
Herbert Xuc83b8fa2012-04-13 02:37:42 +0000766{
Herbert Xuc83b8fa2012-04-13 02:37:42 +0000767 spin_lock(&br->multicast_lock);
768 if (!netif_running(br->dev) || br->multicast_disabled)
769 goto out;
770
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200771 br_multicast_start_querier(br, query);
Herbert Xuc83b8fa2012-04-13 02:37:42 +0000772
773out:
774 spin_unlock(&br->multicast_lock);
775}
776
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200777static void br_ip4_multicast_querier_expired(unsigned long data)
778{
779 struct net_bridge *br = (void *)data;
780
Linus Lüssing90010b32014-06-07 18:26:26 +0200781 br_multicast_querier_expired(br, &br->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200782}
783
784#if IS_ENABLED(CONFIG_IPV6)
785static void br_ip6_multicast_querier_expired(unsigned long data)
786{
787 struct net_bridge *br = (void *)data;
788
Linus Lüssing90010b32014-06-07 18:26:26 +0200789 br_multicast_querier_expired(br, &br->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200790}
791#endif
792
Linus Lüssingdc4eb532014-06-07 18:26:27 +0200793static void br_multicast_select_own_querier(struct net_bridge *br,
794 struct br_ip *ip,
795 struct sk_buff *skb)
796{
797 if (ip->proto == htons(ETH_P_IP))
798 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
799#if IS_ENABLED(CONFIG_IPV6)
800 else
801 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
802#endif
803}
804
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900805static void __br_multicast_send_query(struct net_bridge *br,
806 struct net_bridge_port *port,
807 struct br_ip *ip)
Herbert Xueb1d1642010-02-27 19:41:45 +0000808{
Herbert Xueb1d1642010-02-27 19:41:45 +0000809 struct sk_buff *skb;
810
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900811 skb = br_multicast_alloc_query(br, ip);
Herbert Xueb1d1642010-02-27 19:41:45 +0000812 if (!skb)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900813 return;
Herbert Xueb1d1642010-02-27 19:41:45 +0000814
815 if (port) {
816 __skb_push(skb, sizeof(struct ethhdr));
817 skb->dev = port->dev;
Jan Engelhardt713aefa2010-03-23 04:07:21 +0100818 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
Herbert Xueb1d1642010-02-27 19:41:45 +0000819 dev_queue_xmit);
Linus Lüssingdc4eb532014-06-07 18:26:27 +0200820 } else {
821 br_multicast_select_own_querier(br, ip, skb);
Herbert Xueb1d1642010-02-27 19:41:45 +0000822 netif_rx(skb);
Linus Lüssingdc4eb532014-06-07 18:26:27 +0200823 }
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900824}
Herbert Xueb1d1642010-02-27 19:41:45 +0000825
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900826static void br_multicast_send_query(struct net_bridge *br,
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200827 struct net_bridge_port *port,
Linus Lüssing90010b32014-06-07 18:26:26 +0200828 struct bridge_mcast_own_query *own_query)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900829{
830 unsigned long time;
831 struct br_ip br_group;
Linus Lüssing90010b32014-06-07 18:26:26 +0200832 struct bridge_mcast_other_query *other_query = NULL;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900833
834 if (!netif_running(br->dev) || br->multicast_disabled ||
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200835 !br->multicast_querier)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900836 return;
837
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900838 memset(&br_group.u, 0, sizeof(br_group.u));
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900839
Linus Lüssing90010b32014-06-07 18:26:26 +0200840 if (port ? (own_query == &port->ip4_own_query) :
841 (own_query == &br->ip4_own_query)) {
842 other_query = &br->ip4_other_query;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200843 br_group.proto = htons(ETH_P_IP);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000844#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200845 } else {
Linus Lüssing90010b32014-06-07 18:26:26 +0200846 other_query = &br->ip6_other_query;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200847 br_group.proto = htons(ETH_P_IPV6);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900848#endif
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200849 }
850
Linus Lüssing90010b32014-06-07 18:26:26 +0200851 if (!other_query || timer_pending(&other_query->timer))
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200852 return;
853
854 __br_multicast_send_query(br, port, &br_group);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900855
Herbert Xueb1d1642010-02-27 19:41:45 +0000856 time = jiffies;
Linus Lüssing90010b32014-06-07 18:26:26 +0200857 time += own_query->startup_sent < br->multicast_startup_query_count ?
Herbert Xueb1d1642010-02-27 19:41:45 +0000858 br->multicast_startup_query_interval :
859 br->multicast_query_interval;
Linus Lüssing90010b32014-06-07 18:26:26 +0200860 mod_timer(&own_query->timer, time);
Herbert Xueb1d1642010-02-27 19:41:45 +0000861}
862
Linus Lüssing90010b32014-06-07 18:26:26 +0200863static void
864br_multicast_port_query_expired(struct net_bridge_port *port,
865 struct bridge_mcast_own_query *query)
Herbert Xueb1d1642010-02-27 19:41:45 +0000866{
Herbert Xueb1d1642010-02-27 19:41:45 +0000867 struct net_bridge *br = port->br;
868
869 spin_lock(&br->multicast_lock);
Dan Carpenter02a780c2010-03-06 01:14:09 +0000870 if (port->state == BR_STATE_DISABLED ||
871 port->state == BR_STATE_BLOCKING)
Herbert Xueb1d1642010-02-27 19:41:45 +0000872 goto out;
873
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200874 if (query->startup_sent < br->multicast_startup_query_count)
875 query->startup_sent++;
Herbert Xueb1d1642010-02-27 19:41:45 +0000876
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200877 br_multicast_send_query(port->br, port, query);
Herbert Xueb1d1642010-02-27 19:41:45 +0000878
879out:
880 spin_unlock(&br->multicast_lock);
881}
882
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200883static void br_ip4_multicast_port_query_expired(unsigned long data)
884{
885 struct net_bridge_port *port = (void *)data;
886
Linus Lüssing90010b32014-06-07 18:26:26 +0200887 br_multicast_port_query_expired(port, &port->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200888}
889
890#if IS_ENABLED(CONFIG_IPV6)
891static void br_ip6_multicast_port_query_expired(unsigned long data)
892{
893 struct net_bridge_port *port = (void *)data;
894
Linus Lüssing90010b32014-06-07 18:26:26 +0200895 br_multicast_port_query_expired(port, &port->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200896}
897#endif
898
Herbert Xueb1d1642010-02-27 19:41:45 +0000899void br_multicast_add_port(struct net_bridge_port *port)
900{
901 port->multicast_router = 1;
902
903 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
904 (unsigned long)port);
Linus Lüssing90010b32014-06-07 18:26:26 +0200905 setup_timer(&port->ip4_own_query.timer,
906 br_ip4_multicast_port_query_expired, (unsigned long)port);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200907#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +0200908 setup_timer(&port->ip6_own_query.timer,
909 br_ip6_multicast_port_query_expired, (unsigned long)port);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200910#endif
Herbert Xueb1d1642010-02-27 19:41:45 +0000911}
912
913void br_multicast_del_port(struct net_bridge_port *port)
914{
915 del_timer_sync(&port->multicast_router_timer);
916}
917
Linus Lüssing90010b32014-06-07 18:26:26 +0200918static void br_multicast_enable(struct bridge_mcast_own_query *query)
Herbert Xu561f1102010-02-27 19:41:50 +0000919{
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200920 query->startup_sent = 0;
Herbert Xu561f1102010-02-27 19:41:50 +0000921
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200922 if (try_to_del_timer_sync(&query->timer) >= 0 ||
923 del_timer(&query->timer))
924 mod_timer(&query->timer, jiffies);
Herbert Xu561f1102010-02-27 19:41:50 +0000925}
926
Herbert Xueb1d1642010-02-27 19:41:45 +0000927void br_multicast_enable_port(struct net_bridge_port *port)
928{
929 struct net_bridge *br = port->br;
930
931 spin_lock(&br->multicast_lock);
932 if (br->multicast_disabled || !netif_running(br->dev))
933 goto out;
934
Linus Lüssing90010b32014-06-07 18:26:26 +0200935 br_multicast_enable(&port->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200936#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +0200937 br_multicast_enable(&port->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200938#endif
Herbert Xueb1d1642010-02-27 19:41:45 +0000939
940out:
941 spin_unlock(&br->multicast_lock);
942}
943
944void br_multicast_disable_port(struct net_bridge_port *port)
945{
946 struct net_bridge *br = port->br;
947 struct net_bridge_port_group *pg;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800948 struct hlist_node *n;
Herbert Xueb1d1642010-02-27 19:41:45 +0000949
950 spin_lock(&br->multicast_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800951 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
Herbert Xueb1d1642010-02-27 19:41:45 +0000952 br_multicast_del_pg(br, pg);
953
954 if (!hlist_unhashed(&port->rlist))
955 hlist_del_init_rcu(&port->rlist);
956 del_timer(&port->multicast_router_timer);
Linus Lüssing90010b32014-06-07 18:26:26 +0200957 del_timer(&port->ip4_own_query.timer);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200958#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +0200959 del_timer(&port->ip6_own_query.timer);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200960#endif
Herbert Xueb1d1642010-02-27 19:41:45 +0000961 spin_unlock(&br->multicast_lock);
962}
963
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900964static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
965 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -0400966 struct sk_buff *skb,
967 u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +0000968{
969 struct igmpv3_report *ih;
970 struct igmpv3_grec *grec;
971 int i;
972 int len;
973 int num;
974 int type;
975 int err = 0;
976 __be32 group;
977
978 if (!pskb_may_pull(skb, sizeof(*ih)))
979 return -EINVAL;
980
981 ih = igmpv3_report_hdr(skb);
982 num = ntohs(ih->ngrec);
983 len = sizeof(*ih);
984
985 for (i = 0; i < num; i++) {
986 len += sizeof(*grec);
987 if (!pskb_may_pull(skb, len))
988 return -EINVAL;
989
Herbert Xufd218cf2010-04-07 21:20:47 -0700990 grec = (void *)(skb->data + len - sizeof(*grec));
Herbert Xueb1d1642010-02-27 19:41:45 +0000991 group = grec->grec_mca;
992 type = grec->grec_type;
993
Eric Dumazet8eabf952010-04-20 03:20:05 +0000994 len += ntohs(grec->grec_nsrcs) * 4;
Herbert Xueb1d1642010-02-27 19:41:45 +0000995 if (!pskb_may_pull(skb, len))
996 return -EINVAL;
997
998 /* We treat this as an IGMPv2 report for now. */
999 switch (type) {
1000 case IGMPV3_MODE_IS_INCLUDE:
1001 case IGMPV3_MODE_IS_EXCLUDE:
1002 case IGMPV3_CHANGE_TO_INCLUDE:
1003 case IGMPV3_CHANGE_TO_EXCLUDE:
1004 case IGMPV3_ALLOW_NEW_SOURCES:
1005 case IGMPV3_BLOCK_OLD_SOURCES:
1006 break;
1007
1008 default:
1009 continue;
1010 }
1011
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001012 err = br_ip4_multicast_add_group(br, port, group, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001013 if (err)
1014 break;
1015 }
1016
1017 return err;
1018}
1019
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001020#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001021static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1022 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001023 struct sk_buff *skb,
1024 u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001025{
1026 struct icmp6hdr *icmp6h;
1027 struct mld2_grec *grec;
1028 int i;
1029 int len;
1030 int num;
1031 int err = 0;
1032
1033 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1034 return -EINVAL;
1035
1036 icmp6h = icmp6_hdr(skb);
1037 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1038 len = sizeof(*icmp6h);
1039
1040 for (i = 0; i < num; i++) {
1041 __be16 *nsrcs, _nsrcs;
1042
1043 nsrcs = skb_header_pointer(skb,
1044 len + offsetof(struct mld2_grec,
Linus Lüssing649e9842011-02-15 13:19:18 +00001045 grec_nsrcs),
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001046 sizeof(_nsrcs), &_nsrcs);
1047 if (!nsrcs)
1048 return -EINVAL;
1049
1050 if (!pskb_may_pull(skb,
1051 len + sizeof(*grec) +
Linus Lüssingd41db9f2011-02-15 13:19:19 +00001052 sizeof(struct in6_addr) * ntohs(*nsrcs)))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001053 return -EINVAL;
1054
1055 grec = (struct mld2_grec *)(skb->data + len);
Linus Lüssingd41db9f2011-02-15 13:19:19 +00001056 len += sizeof(*grec) +
1057 sizeof(struct in6_addr) * ntohs(*nsrcs);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001058
1059 /* We treat these as MLDv1 reports for now. */
1060 switch (grec->grec_type) {
1061 case MLD2_MODE_IS_INCLUDE:
1062 case MLD2_MODE_IS_EXCLUDE:
1063 case MLD2_CHANGE_TO_INCLUDE:
1064 case MLD2_CHANGE_TO_EXCLUDE:
1065 case MLD2_ALLOW_NEW_SOURCES:
1066 case MLD2_BLOCK_OLD_SOURCES:
1067 break;
1068
1069 default:
1070 continue;
1071 }
1072
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001073 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1074 vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001075 if (!err)
1076 break;
1077 }
1078
1079 return err;
1080}
1081#endif
1082
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001083static bool br_ip4_multicast_select_querier(struct net_bridge *br,
Linus Lüssing2cd41432014-06-07 18:26:29 +02001084 struct net_bridge_port *port,
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001085 __be32 saddr)
1086{
1087 if (!timer_pending(&br->ip4_own_query.timer) &&
1088 !timer_pending(&br->ip4_other_query.timer))
1089 goto update;
1090
1091 if (!br->ip4_querier.addr.u.ip4)
1092 goto update;
1093
1094 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1095 goto update;
1096
1097 return false;
1098
1099update:
1100 br->ip4_querier.addr.u.ip4 = saddr;
1101
Linus Lüssing2cd41432014-06-07 18:26:29 +02001102 /* update protected by general multicast_lock by caller */
1103 rcu_assign_pointer(br->ip4_querier.port, port);
1104
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001105 return true;
1106}
1107
1108#if IS_ENABLED(CONFIG_IPV6)
1109static bool br_ip6_multicast_select_querier(struct net_bridge *br,
Linus Lüssing2cd41432014-06-07 18:26:29 +02001110 struct net_bridge_port *port,
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001111 struct in6_addr *saddr)
1112{
1113 if (!timer_pending(&br->ip6_own_query.timer) &&
1114 !timer_pending(&br->ip6_other_query.timer))
1115 goto update;
1116
1117 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1118 goto update;
1119
1120 return false;
1121
1122update:
1123 br->ip6_querier.addr.u.ip6 = *saddr;
1124
Linus Lüssing2cd41432014-06-07 18:26:29 +02001125 /* update protected by general multicast_lock by caller */
1126 rcu_assign_pointer(br->ip6_querier.port, port);
1127
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001128 return true;
1129}
1130#endif
1131
1132static bool br_multicast_select_querier(struct net_bridge *br,
Linus Lüssing2cd41432014-06-07 18:26:29 +02001133 struct net_bridge_port *port,
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001134 struct br_ip *saddr)
1135{
1136 switch (saddr->proto) {
1137 case htons(ETH_P_IP):
Linus Lüssing2cd41432014-06-07 18:26:29 +02001138 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001139#if IS_ENABLED(CONFIG_IPV6)
1140 case htons(ETH_P_IPV6):
Linus Lüssing2cd41432014-06-07 18:26:29 +02001141 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001142#endif
1143 }
1144
1145 return false;
1146}
1147
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001148static void
Linus Lüssing90010b32014-06-07 18:26:26 +02001149br_multicast_update_query_timer(struct net_bridge *br,
1150 struct bridge_mcast_other_query *query,
1151 unsigned long max_delay)
Linus Lüssingb00589a2013-08-01 01:06:20 +02001152{
Linus Lüssing90010b32014-06-07 18:26:26 +02001153 if (!timer_pending(&query->timer))
1154 query->delay_time = jiffies + max_delay;
Linus Lüssingb00589a2013-08-01 01:06:20 +02001155
Linus Lüssing90010b32014-06-07 18:26:26 +02001156 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
Linus Lüssingb00589a2013-08-01 01:06:20 +02001157}
1158
stephen hemminger7e80c122010-04-27 15:01:04 +00001159/*
Cong Wang7c776022013-06-21 15:37:25 +08001160 * Add port to router_list
stephen hemminger7e80c122010-04-27 15:01:04 +00001161 * list is maintained ordered by pointer value
1162 * and locked by br->multicast_lock and RCU
1163 */
Herbert Xu0909e112010-02-27 19:41:49 +00001164static void br_multicast_add_router(struct net_bridge *br,
1165 struct net_bridge_port *port)
1166{
stephen hemmingerdcdca2c2010-04-27 07:13:11 +00001167 struct net_bridge_port *p;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001168 struct hlist_node *slot = NULL;
Herbert Xu0909e112010-02-27 19:41:49 +00001169
Sasha Levinb67bfe02013-02-27 17:06:00 -08001170 hlist_for_each_entry(p, &br->router_list, rlist) {
stephen hemminger7e80c122010-04-27 15:01:04 +00001171 if ((unsigned long) port >= (unsigned long) p)
1172 break;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001173 slot = &p->rlist;
stephen hemmingerdcdca2c2010-04-27 07:13:11 +00001174 }
Herbert Xu0909e112010-02-27 19:41:49 +00001175
stephen hemminger7e80c122010-04-27 15:01:04 +00001176 if (slot)
Ken Helias1d023282014-08-06 16:09:16 -07001177 hlist_add_behind_rcu(&port->rlist, slot);
stephen hemmingerdcdca2c2010-04-27 07:13:11 +00001178 else
1179 hlist_add_head_rcu(&port->rlist, &br->router_list);
Herbert Xu0909e112010-02-27 19:41:49 +00001180}
1181
Herbert Xueb1d1642010-02-27 19:41:45 +00001182static void br_multicast_mark_router(struct net_bridge *br,
1183 struct net_bridge_port *port)
1184{
1185 unsigned long now = jiffies;
Herbert Xueb1d1642010-02-27 19:41:45 +00001186
1187 if (!port) {
1188 if (br->multicast_router == 1)
1189 mod_timer(&br->multicast_router_timer,
1190 now + br->multicast_querier_interval);
1191 return;
1192 }
1193
1194 if (port->multicast_router != 1)
1195 return;
1196
1197 if (!hlist_unhashed(&port->rlist))
1198 goto timer;
1199
Herbert Xu0909e112010-02-27 19:41:49 +00001200 br_multicast_add_router(br, port);
Herbert Xueb1d1642010-02-27 19:41:45 +00001201
1202timer:
1203 mod_timer(&port->multicast_router_timer,
1204 now + br->multicast_querier_interval);
1205}
1206
1207static void br_multicast_query_received(struct net_bridge *br,
1208 struct net_bridge_port *port,
Linus Lüssing90010b32014-06-07 18:26:26 +02001209 struct bridge_mcast_other_query *query,
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001210 struct br_ip *saddr,
Linus Lüssingb00589a2013-08-01 01:06:20 +02001211 unsigned long max_delay)
Herbert Xueb1d1642010-02-27 19:41:45 +00001212{
Linus Lüssing2cd41432014-06-07 18:26:29 +02001213 if (!br_multicast_select_querier(br, port, saddr))
Herbert Xueb1d1642010-02-27 19:41:45 +00001214 return;
1215
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001216 br_multicast_update_query_timer(br, query, max_delay);
Herbert Xueb1d1642010-02-27 19:41:45 +00001217 br_multicast_mark_router(br, port);
1218}
1219
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001220static int br_ip4_multicast_query(struct net_bridge *br,
1221 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001222 struct sk_buff *skb,
1223 u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +00001224{
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001225 const struct iphdr *iph = ip_hdr(skb);
Herbert Xueb1d1642010-02-27 19:41:45 +00001226 struct igmphdr *ih = igmp_hdr(skb);
1227 struct net_bridge_mdb_entry *mp;
1228 struct igmpv3_query *ih3;
1229 struct net_bridge_port_group *p;
Eric Dumazete8051682010-11-15 06:38:10 +00001230 struct net_bridge_port_group __rcu **pp;
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001231 struct br_ip saddr;
Herbert Xueb1d1642010-02-27 19:41:45 +00001232 unsigned long max_delay;
1233 unsigned long now = jiffies;
1234 __be32 group;
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001235 int err = 0;
Herbert Xueb1d1642010-02-27 19:41:45 +00001236
1237 spin_lock(&br->multicast_lock);
1238 if (!netif_running(br->dev) ||
1239 (port && port->state == BR_STATE_DISABLED))
1240 goto out;
1241
Herbert Xueb1d1642010-02-27 19:41:45 +00001242 group = ih->group;
1243
1244 if (skb->len == sizeof(*ih)) {
1245 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1246
1247 if (!max_delay) {
1248 max_delay = 10 * HZ;
1249 group = 0;
1250 }
1251 } else {
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001252 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1253 err = -EINVAL;
1254 goto out;
1255 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001256
1257 ih3 = igmpv3_query_hdr(skb);
1258 if (ih3->nsrcs)
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001259 goto out;
Herbert Xueb1d1642010-02-27 19:41:45 +00001260
YOSHIFUJI Hideaki / 吉藤英明0ba8c9e2010-03-15 19:27:00 +00001261 max_delay = ih3->code ?
1262 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
Herbert Xueb1d1642010-02-27 19:41:45 +00001263 }
1264
Linus Lüssing9ed973c2014-03-10 22:25:24 +01001265 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1266 * all-systems destination addresses (224.0.0.1) for general queries
1267 */
1268 if (!group && iph->daddr != htonl(INADDR_ALLHOSTS_GROUP)) {
1269 err = -EINVAL;
1270 goto out;
1271 }
1272
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001273 if (!group) {
1274 saddr.proto = htons(ETH_P_IP);
1275 saddr.u.ip4 = iph->saddr;
Linus Lüssingb00589a2013-08-01 01:06:20 +02001276
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001277 br_multicast_query_received(br, port, &br->ip4_other_query,
1278 &saddr, max_delay);
Herbert Xueb1d1642010-02-27 19:41:45 +00001279 goto out;
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001280 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001281
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001282 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001283 if (!mp)
1284 goto out;
1285
1286 max_delay *= br->multicast_last_member_count;
1287
Herbert Xu8a870172011-02-12 01:05:42 -08001288 if (mp->mglist &&
Herbert Xueb1d1642010-02-27 19:41:45 +00001289 (timer_pending(&mp->timer) ?
1290 time_after(mp->timer.expires, now + max_delay) :
1291 try_to_del_timer_sync(&mp->timer) >= 0))
1292 mod_timer(&mp->timer, now + max_delay);
1293
Eric Dumazete8051682010-11-15 06:38:10 +00001294 for (pp = &mp->ports;
1295 (p = mlock_dereference(*pp, br)) != NULL;
1296 pp = &p->next) {
Herbert Xueb1d1642010-02-27 19:41:45 +00001297 if (timer_pending(&p->timer) ?
1298 time_after(p->timer.expires, now + max_delay) :
1299 try_to_del_timer_sync(&p->timer) >= 0)
Herbert Xu24f9cdc2011-02-11 12:42:07 +00001300 mod_timer(&p->timer, now + max_delay);
Herbert Xueb1d1642010-02-27 19:41:45 +00001301 }
1302
1303out:
1304 spin_unlock(&br->multicast_lock);
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001305 return err;
Herbert Xueb1d1642010-02-27 19:41:45 +00001306}
1307
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001308#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001309static int br_ip6_multicast_query(struct net_bridge *br,
1310 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001311 struct sk_buff *skb,
1312 u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001313{
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001314 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
stephen hemmingereca2a432012-12-13 06:51:28 +00001315 struct mld_msg *mld;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001316 struct net_bridge_mdb_entry *mp;
1317 struct mld2_query *mld2q;
Eric Dumazete8051682010-11-15 06:38:10 +00001318 struct net_bridge_port_group *p;
1319 struct net_bridge_port_group __rcu **pp;
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001320 struct br_ip saddr;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001321 unsigned long max_delay;
1322 unsigned long now = jiffies;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001323 const struct in6_addr *group = NULL;
Linus Lüssing9ed973c2014-03-10 22:25:24 +01001324 bool is_general_query;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001325 int err = 0;
1326
1327 spin_lock(&br->multicast_lock);
1328 if (!netif_running(br->dev) ||
1329 (port && port->state == BR_STATE_DISABLED))
1330 goto out;
1331
Linus Lüssing6565b9e2014-03-04 03:57:35 +01001332 /* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
1333 if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
1334 err = -EINVAL;
1335 goto out;
1336 }
1337
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001338 if (skb->len == sizeof(*mld)) {
1339 if (!pskb_may_pull(skb, sizeof(*mld))) {
1340 err = -EINVAL;
1341 goto out;
1342 }
1343 mld = (struct mld_msg *) icmp6_hdr(skb);
Li RongQing47152132012-07-09 23:56:12 +00001344 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001345 if (max_delay)
1346 group = &mld->mld_mca;
Linus Lüssing248ba8e2013-08-06 00:32:05 +02001347 } else {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001348 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1349 err = -EINVAL;
1350 goto out;
1351 }
1352 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1353 if (!mld2q->mld2q_nsrcs)
1354 group = &mld2q->mld2q_mca;
Daniel Borkmanne3f5b172013-09-04 00:19:39 +02001355
1356 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001357 }
1358
Linus Lüssing9ed973c2014-03-10 22:25:24 +01001359 is_general_query = group && ipv6_addr_any(group);
1360
1361 /* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer
1362 * all-nodes destination address (ff02::1) for general queries
1363 */
1364 if (is_general_query && !ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) {
1365 err = -EINVAL;
1366 goto out;
1367 }
1368
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001369 if (is_general_query) {
1370 saddr.proto = htons(ETH_P_IPV6);
1371 saddr.u.ip6 = ip6h->saddr;
Linus Lüssingb00589a2013-08-01 01:06:20 +02001372
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001373 br_multicast_query_received(br, port, &br->ip6_other_query,
1374 &saddr, max_delay);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001375 goto out;
Linus Lüssing6c03ee82014-06-12 01:41:23 +02001376 } else if (!group) {
1377 goto out;
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001378 }
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001379
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001380 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001381 if (!mp)
1382 goto out;
1383
1384 max_delay *= br->multicast_last_member_count;
Herbert Xu8a870172011-02-12 01:05:42 -08001385 if (mp->mglist &&
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001386 (timer_pending(&mp->timer) ?
1387 time_after(mp->timer.expires, now + max_delay) :
1388 try_to_del_timer_sync(&mp->timer) >= 0))
1389 mod_timer(&mp->timer, now + max_delay);
1390
Eric Dumazete8051682010-11-15 06:38:10 +00001391 for (pp = &mp->ports;
1392 (p = mlock_dereference(*pp, br)) != NULL;
1393 pp = &p->next) {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001394 if (timer_pending(&p->timer) ?
1395 time_after(p->timer.expires, now + max_delay) :
1396 try_to_del_timer_sync(&p->timer) >= 0)
Herbert Xu24f9cdc2011-02-11 12:42:07 +00001397 mod_timer(&p->timer, now + max_delay);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001398 }
1399
1400out:
1401 spin_unlock(&br->multicast_lock);
1402 return err;
1403}
1404#endif
1405
Linus Lüssing90010b32014-06-07 18:26:26 +02001406static void
1407br_multicast_leave_group(struct net_bridge *br,
1408 struct net_bridge_port *port,
1409 struct br_ip *group,
1410 struct bridge_mcast_other_query *other_query,
1411 struct bridge_mcast_own_query *own_query)
Herbert Xueb1d1642010-02-27 19:41:45 +00001412{
1413 struct net_bridge_mdb_htable *mdb;
1414 struct net_bridge_mdb_entry *mp;
1415 struct net_bridge_port_group *p;
1416 unsigned long now;
1417 unsigned long time;
1418
Herbert Xueb1d1642010-02-27 19:41:45 +00001419 spin_lock(&br->multicast_lock);
1420 if (!netif_running(br->dev) ||
1421 (port && port->state == BR_STATE_DISABLED) ||
Linus Lüssing90010b32014-06-07 18:26:26 +02001422 timer_pending(&other_query->timer))
Herbert Xueb1d1642010-02-27 19:41:45 +00001423 goto out;
1424
Eric Dumazete8051682010-11-15 06:38:10 +00001425 mdb = mlock_dereference(br->mdb, br);
Herbert Xueb1d1642010-02-27 19:41:45 +00001426 mp = br_mdb_ip_get(mdb, group);
1427 if (!mp)
1428 goto out;
1429
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001430 if (br->multicast_querier) {
Cong Wang6b7df112013-05-21 21:52:56 +00001431 __br_multicast_send_query(br, port, &mp->addr);
1432
1433 time = jiffies + br->multicast_last_member_count *
1434 br->multicast_last_member_interval;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001435
Linus Lüssing90010b32014-06-07 18:26:26 +02001436 mod_timer(&own_query->timer, time);
Cong Wang6b7df112013-05-21 21:52:56 +00001437
1438 for (p = mlock_dereference(mp->ports, br);
1439 p != NULL;
1440 p = mlock_dereference(p->next, br)) {
1441 if (p->port != port)
1442 continue;
1443
1444 if (!hlist_unhashed(&p->mglist) &&
1445 (timer_pending(&p->timer) ?
1446 time_after(p->timer.expires, time) :
1447 try_to_del_timer_sync(&p->timer) >= 0)) {
1448 mod_timer(&p->timer, time);
1449 }
1450
1451 break;
1452 }
1453 }
1454
David S. Millerc2d3bab2012-12-05 16:24:45 -05001455 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
Amerigo Wang50426b52012-12-03 23:56:40 +00001456 struct net_bridge_port_group __rcu **pp;
1457
1458 for (pp = &mp->ports;
1459 (p = mlock_dereference(*pp, br)) != NULL;
1460 pp = &p->next) {
1461 if (p->port != port)
1462 continue;
1463
1464 rcu_assign_pointer(*pp, p->next);
1465 hlist_del_init(&p->mglist);
1466 del_timer(&p->timer);
1467 call_rcu_bh(&p->rcu, br_multicast_free_pg);
Cong Wang37a393b2012-12-11 22:23:07 +00001468 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
Amerigo Wang50426b52012-12-03 23:56:40 +00001469
Linus Lüssing454594f2013-10-20 00:58:57 +02001470 if (!mp->ports && !mp->mglist &&
Amerigo Wang50426b52012-12-03 23:56:40 +00001471 netif_running(br->dev))
1472 mod_timer(&mp->timer, jiffies);
1473 }
1474 goto out;
1475 }
1476
Herbert Xueb1d1642010-02-27 19:41:45 +00001477 now = jiffies;
1478 time = now + br->multicast_last_member_count *
1479 br->multicast_last_member_interval;
1480
1481 if (!port) {
Linus Lüssing454594f2013-10-20 00:58:57 +02001482 if (mp->mglist &&
Herbert Xueb1d1642010-02-27 19:41:45 +00001483 (timer_pending(&mp->timer) ?
1484 time_after(mp->timer.expires, time) :
1485 try_to_del_timer_sync(&mp->timer) >= 0)) {
1486 mod_timer(&mp->timer, time);
Herbert Xueb1d1642010-02-27 19:41:45 +00001487 }
Linus Lüssing454594f2013-10-20 00:58:57 +02001488
1489 goto out;
1490 }
1491
1492 for (p = mlock_dereference(mp->ports, br);
1493 p != NULL;
1494 p = mlock_dereference(p->next, br)) {
1495 if (p->port != port)
1496 continue;
1497
1498 if (!hlist_unhashed(&p->mglist) &&
1499 (timer_pending(&p->timer) ?
1500 time_after(p->timer.expires, time) :
1501 try_to_del_timer_sync(&p->timer) >= 0)) {
1502 mod_timer(&p->timer, time);
1503 }
1504
1505 break;
Herbert Xueb1d1642010-02-27 19:41:45 +00001506 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001507out:
1508 spin_unlock(&br->multicast_lock);
1509}
1510
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001511static void br_ip4_multicast_leave_group(struct net_bridge *br,
1512 struct net_bridge_port *port,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001513 __be32 group,
1514 __u16 vid)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001515{
1516 struct br_ip br_group;
Linus Lüssing90010b32014-06-07 18:26:26 +02001517 struct bridge_mcast_own_query *own_query;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001518
1519 if (ipv4_is_local_multicast(group))
1520 return;
1521
Linus Lüssing90010b32014-06-07 18:26:26 +02001522 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1523
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001524 br_group.u.ip4 = group;
1525 br_group.proto = htons(ETH_P_IP);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001526 br_group.vid = vid;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001527
Linus Lüssing90010b32014-06-07 18:26:26 +02001528 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1529 own_query);
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001530}
1531
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001532#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001533static void br_ip6_multicast_leave_group(struct net_bridge *br,
1534 struct net_bridge_port *port,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001535 const struct in6_addr *group,
1536 __u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001537{
1538 struct br_ip br_group;
Linus Lüssing90010b32014-06-07 18:26:26 +02001539 struct bridge_mcast_own_query *own_query;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001540
Linus Lüssing3c3769e2013-09-04 02:13:39 +02001541 if (ipv6_addr_is_ll_all_nodes(group))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001542 return;
1543
Linus Lüssing90010b32014-06-07 18:26:26 +02001544 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1545
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001546 br_group.u.ip6 = *group;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001547 br_group.proto = htons(ETH_P_IPV6);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001548 br_group.vid = vid;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001549
Linus Lüssing90010b32014-06-07 18:26:26 +02001550 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1551 own_query);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001552}
1553#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001554
Herbert Xueb1d1642010-02-27 19:41:45 +00001555static int br_multicast_ipv4_rcv(struct net_bridge *br,
1556 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001557 struct sk_buff *skb,
1558 u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +00001559{
1560 struct sk_buff *skb2 = skb;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001561 const struct iphdr *iph;
Herbert Xueb1d1642010-02-27 19:41:45 +00001562 struct igmphdr *ih;
Eric Dumazet95c96172012-04-15 05:58:06 +00001563 unsigned int len;
1564 unsigned int offset;
Herbert Xueb1d1642010-02-27 19:41:45 +00001565 int err;
1566
Herbert Xueb1d1642010-02-27 19:41:45 +00001567 /* We treat OOM as packet loss for now. */
1568 if (!pskb_may_pull(skb, sizeof(*iph)))
1569 return -EINVAL;
1570
1571 iph = ip_hdr(skb);
1572
1573 if (iph->ihl < 5 || iph->version != 4)
1574 return -EINVAL;
1575
1576 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1577 return -EINVAL;
1578
1579 iph = ip_hdr(skb);
1580
1581 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1582 return -EINVAL;
1583
Herbert Xubd4265f2011-06-23 02:39:12 +00001584 if (iph->protocol != IPPROTO_IGMP) {
Amerigo Wangbf5e4dd2013-03-07 02:32:26 +00001585 if (!ipv4_is_local_multicast(iph->daddr))
Herbert Xubd4265f2011-06-23 02:39:12 +00001586 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
Herbert Xueb1d1642010-02-27 19:41:45 +00001587 return 0;
Herbert Xubd4265f2011-06-23 02:39:12 +00001588 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001589
1590 len = ntohs(iph->tot_len);
1591 if (skb->len < len || len < ip_hdrlen(skb))
1592 return -EINVAL;
1593
1594 if (skb->len > len) {
1595 skb2 = skb_clone(skb, GFP_ATOMIC);
1596 if (!skb2)
1597 return -ENOMEM;
1598
1599 err = pskb_trim_rcsum(skb2, len);
1600 if (err)
YOSHIFUJI Hideaki / 吉藤英明84408532010-03-15 19:26:56 +00001601 goto err_out;
Herbert Xueb1d1642010-02-27 19:41:45 +00001602 }
1603
1604 len -= ip_hdrlen(skb2);
1605 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1606 __skb_pull(skb2, offset);
1607 skb_reset_transport_header(skb2);
1608
1609 err = -EINVAL;
1610 if (!pskb_may_pull(skb2, sizeof(*ih)))
1611 goto out;
1612
Herbert Xueb1d1642010-02-27 19:41:45 +00001613 switch (skb2->ip_summed) {
1614 case CHECKSUM_COMPLETE:
1615 if (!csum_fold(skb2->csum))
1616 break;
1617 /* fall through */
1618 case CHECKSUM_NONE:
1619 skb2->csum = 0;
1620 if (skb_checksum_complete(skb2))
YOSHIFUJI Hideaki / 吉藤英明84408532010-03-15 19:26:56 +00001621 goto out;
Herbert Xueb1d1642010-02-27 19:41:45 +00001622 }
1623
1624 err = 0;
1625
1626 BR_INPUT_SKB_CB(skb)->igmp = 1;
1627 ih = igmp_hdr(skb2);
1628
1629 switch (ih->type) {
1630 case IGMP_HOST_MEMBERSHIP_REPORT:
1631 case IGMPV2_HOST_MEMBERSHIP_REPORT:
Fernando Luis Vázquez Cao62b2bcb2011-06-13 15:04:43 +00001632 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001633 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001634 break;
1635 case IGMPV3_HOST_MEMBERSHIP_REPORT:
Vlad Yasevich06499092013-10-28 15:45:07 -04001636 err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001637 break;
1638 case IGMP_HOST_MEMBERSHIP_QUERY:
Vlad Yasevich06499092013-10-28 15:45:07 -04001639 err = br_ip4_multicast_query(br, port, skb2, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001640 break;
1641 case IGMP_HOST_LEAVE_MESSAGE:
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001642 br_ip4_multicast_leave_group(br, port, ih->group, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001643 break;
1644 }
1645
1646out:
1647 __skb_push(skb2, offset);
YOSHIFUJI Hideaki / 吉藤英明84408532010-03-15 19:26:56 +00001648err_out:
Herbert Xueb1d1642010-02-27 19:41:45 +00001649 if (skb2 != skb)
1650 kfree_skb(skb2);
1651 return err;
1652}
1653
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001654#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001655static int br_multicast_ipv6_rcv(struct net_bridge *br,
1656 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001657 struct sk_buff *skb,
1658 u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001659{
Tomas Winkler9d890812011-01-03 11:26:08 -08001660 struct sk_buff *skb2;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001661 const struct ipv6hdr *ip6h;
Eric Dumazet22df1332011-08-23 19:57:05 +00001662 u8 icmp6_type;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001663 u8 nexthdr;
Jesse Gross75f28112011-11-30 17:05:51 -08001664 __be16 frag_off;
Eric Dumazet95c96172012-04-15 05:58:06 +00001665 unsigned int len;
Kulikov Vasiliybb7a0bd2010-07-15 08:47:33 +00001666 int offset;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001667 int err;
1668
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001669 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1670 return -EINVAL;
1671
1672 ip6h = ipv6_hdr(skb);
1673
1674 /*
1675 * We're interested in MLD messages only.
1676 * - Version is 6
1677 * - MLD has always Router Alert hop-by-hop option
1678 * - But we do not support jumbrograms.
1679 */
Linus Lüssing8fad9c392013-09-04 02:13:38 +02001680 if (ip6h->version != 6)
1681 return 0;
1682
1683 /* Prevent flooding this packet if there is no listener present */
Linus Lüssing3c3769e2013-09-04 02:13:39 +02001684 if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
Linus Lüssing8fad9c392013-09-04 02:13:38 +02001685 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1686
1687 if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001688 ip6h->payload_len == 0)
1689 return 0;
1690
Linus Lüssingff9a57a2011-03-26 20:27:24 +00001691 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001692 if (skb->len < len)
1693 return -EINVAL;
1694
1695 nexthdr = ip6h->nexthdr;
Jesse Gross75f28112011-11-30 17:05:51 -08001696 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001697
1698 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1699 return 0;
1700
1701 /* Okay, we found ICMPv6 header */
1702 skb2 = skb_clone(skb, GFP_ATOMIC);
1703 if (!skb2)
1704 return -ENOMEM;
1705
Tomas Winkler9d890812011-01-03 11:26:08 -08001706 err = -EINVAL;
1707 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1708 goto out;
1709
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001710 len -= offset - skb_network_offset(skb2);
1711
1712 __skb_pull(skb2, offset);
1713 skb_reset_transport_header(skb2);
stephen hemmingerfa2da8c2011-11-15 08:09:14 +00001714 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1715 skb_network_header_len(skb2));
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001716
Eric Dumazet22df1332011-08-23 19:57:05 +00001717 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001718
Eric Dumazet22df1332011-08-23 19:57:05 +00001719 switch (icmp6_type) {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001720 case ICMPV6_MGM_QUERY:
1721 case ICMPV6_MGM_REPORT:
1722 case ICMPV6_MGM_REDUCTION:
1723 case ICMPV6_MLD2_REPORT:
1724 break;
1725 default:
1726 err = 0;
1727 goto out;
1728 }
1729
1730 /* Okay, we found MLD message. Check further. */
1731 if (skb2->len > len) {
1732 err = pskb_trim_rcsum(skb2, len);
1733 if (err)
1734 goto out;
Yan, Zheng4b275d72011-08-23 22:54:33 +00001735 err = -EINVAL;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001736 }
1737
Yan, Zheng4b275d72011-08-23 22:54:33 +00001738 ip6h = ipv6_hdr(skb2);
1739
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001740 switch (skb2->ip_summed) {
1741 case CHECKSUM_COMPLETE:
Yan, Zheng4b275d72011-08-23 22:54:33 +00001742 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1743 IPPROTO_ICMPV6, skb2->csum))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001744 break;
1745 /*FALLTHROUGH*/
1746 case CHECKSUM_NONE:
Yan, Zheng4b275d72011-08-23 22:54:33 +00001747 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1748 &ip6h->daddr,
1749 skb2->len,
1750 IPPROTO_ICMPV6, 0));
1751 if (__skb_checksum_complete(skb2))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001752 goto out;
1753 }
1754
1755 err = 0;
1756
1757 BR_INPUT_SKB_CB(skb)->igmp = 1;
1758
Eric Dumazet22df1332011-08-23 19:57:05 +00001759 switch (icmp6_type) {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001760 case ICMPV6_MGM_REPORT:
1761 {
Tomas Winkler9d890812011-01-03 11:26:08 -08001762 struct mld_msg *mld;
1763 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1764 err = -EINVAL;
1765 goto out;
1766 }
1767 mld = (struct mld_msg *)skb_transport_header(skb2);
Fernando Luis Vázquez Caofc2af6c2011-06-13 15:06:58 +00001768 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001769 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001770 break;
1771 }
1772 case ICMPV6_MLD2_REPORT:
Vlad Yasevich06499092013-10-28 15:45:07 -04001773 err = br_ip6_multicast_mld2_report(br, port, skb2, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001774 break;
1775 case ICMPV6_MGM_QUERY:
Vlad Yasevich06499092013-10-28 15:45:07 -04001776 err = br_ip6_multicast_query(br, port, skb2, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001777 break;
1778 case ICMPV6_MGM_REDUCTION:
1779 {
Tomas Winkler9d890812011-01-03 11:26:08 -08001780 struct mld_msg *mld;
1781 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1782 err = -EINVAL;
1783 goto out;
1784 }
1785 mld = (struct mld_msg *)skb_transport_header(skb2);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001786 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001787 }
1788 }
1789
1790out:
Tomas Winkler9d890812011-01-03 11:26:08 -08001791 kfree_skb(skb2);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001792 return err;
1793}
1794#endif
1795
Herbert Xueb1d1642010-02-27 19:41:45 +00001796int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001797 struct sk_buff *skb, u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +00001798{
YOSHIFUJI Hideaki / 吉藤英明1fafc7a2010-04-25 08:06:40 +00001799 BR_INPUT_SKB_CB(skb)->igmp = 0;
1800 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1801
Herbert Xueb1d1642010-02-27 19:41:45 +00001802 if (br->multicast_disabled)
1803 return 0;
1804
1805 switch (skb->protocol) {
1806 case htons(ETH_P_IP):
Vlad Yasevich06499092013-10-28 15:45:07 -04001807 return br_multicast_ipv4_rcv(br, port, skb, vid);
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001808#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001809 case htons(ETH_P_IPV6):
Vlad Yasevich06499092013-10-28 15:45:07 -04001810 return br_multicast_ipv6_rcv(br, port, skb, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001811#endif
Herbert Xueb1d1642010-02-27 19:41:45 +00001812 }
1813
1814 return 0;
1815}
1816
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001817static void br_multicast_query_expired(struct net_bridge *br,
Linus Lüssing2cd41432014-06-07 18:26:29 +02001818 struct bridge_mcast_own_query *query,
1819 struct bridge_mcast_querier *querier)
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001820{
1821 spin_lock(&br->multicast_lock);
1822 if (query->startup_sent < br->multicast_startup_query_count)
1823 query->startup_sent++;
1824
Linus Lüssing2cd41432014-06-07 18:26:29 +02001825 rcu_assign_pointer(querier, NULL);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001826 br_multicast_send_query(br, NULL, query);
1827 spin_unlock(&br->multicast_lock);
1828}
1829
1830static void br_ip4_multicast_query_expired(unsigned long data)
Herbert Xueb1d1642010-02-27 19:41:45 +00001831{
1832 struct net_bridge *br = (void *)data;
1833
Linus Lüssing2cd41432014-06-07 18:26:29 +02001834 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
Herbert Xueb1d1642010-02-27 19:41:45 +00001835}
1836
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001837#if IS_ENABLED(CONFIG_IPV6)
1838static void br_ip6_multicast_query_expired(unsigned long data)
1839{
1840 struct net_bridge *br = (void *)data;
1841
Linus Lüssing2cd41432014-06-07 18:26:29 +02001842 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001843}
1844#endif
1845
Herbert Xueb1d1642010-02-27 19:41:45 +00001846void br_multicast_init(struct net_bridge *br)
1847{
1848 br->hash_elasticity = 4;
1849 br->hash_max = 512;
1850
1851 br->multicast_router = 1;
Herbert Xuc5c23262012-04-13 02:37:42 +00001852 br->multicast_querier = 0;
Cong Wang1c8ad5b2013-05-21 21:52:54 +00001853 br->multicast_query_use_ifaddr = 0;
Herbert Xueb1d1642010-02-27 19:41:45 +00001854 br->multicast_last_member_count = 2;
1855 br->multicast_startup_query_count = 2;
1856
1857 br->multicast_last_member_interval = HZ;
1858 br->multicast_query_response_interval = 10 * HZ;
1859 br->multicast_startup_query_interval = 125 * HZ / 4;
1860 br->multicast_query_interval = 125 * HZ;
1861 br->multicast_querier_interval = 255 * HZ;
1862 br->multicast_membership_interval = 260 * HZ;
1863
Linus Lüssing90010b32014-06-07 18:26:26 +02001864 br->ip4_other_query.delay_time = 0;
Linus Lüssing2cd41432014-06-07 18:26:29 +02001865 br->ip4_querier.port = NULL;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001866#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001867 br->ip6_other_query.delay_time = 0;
Linus Lüssing2cd41432014-06-07 18:26:29 +02001868 br->ip6_querier.port = NULL;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001869#endif
Linus Lüssingb00589a2013-08-01 01:06:20 +02001870
Herbert Xueb1d1642010-02-27 19:41:45 +00001871 spin_lock_init(&br->multicast_lock);
1872 setup_timer(&br->multicast_router_timer,
1873 br_multicast_local_router_expired, 0);
Linus Lüssing90010b32014-06-07 18:26:26 +02001874 setup_timer(&br->ip4_other_query.timer,
1875 br_ip4_multicast_querier_expired, (unsigned long)br);
1876 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001877 (unsigned long)br);
1878#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001879 setup_timer(&br->ip6_other_query.timer,
1880 br_ip6_multicast_querier_expired, (unsigned long)br);
1881 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001882 (unsigned long)br);
1883#endif
Herbert Xueb1d1642010-02-27 19:41:45 +00001884}
1885
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001886static void __br_multicast_open(struct net_bridge *br,
Linus Lüssing90010b32014-06-07 18:26:26 +02001887 struct bridge_mcast_own_query *query)
Herbert Xueb1d1642010-02-27 19:41:45 +00001888{
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001889 query->startup_sent = 0;
Herbert Xueb1d1642010-02-27 19:41:45 +00001890
1891 if (br->multicast_disabled)
1892 return;
1893
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001894 mod_timer(&query->timer, jiffies);
1895}
1896
1897void br_multicast_open(struct net_bridge *br)
1898{
Linus Lüssing90010b32014-06-07 18:26:26 +02001899 __br_multicast_open(br, &br->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001900#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001901 __br_multicast_open(br, &br->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001902#endif
Herbert Xueb1d1642010-02-27 19:41:45 +00001903}
1904
1905void br_multicast_stop(struct net_bridge *br)
1906{
1907 struct net_bridge_mdb_htable *mdb;
1908 struct net_bridge_mdb_entry *mp;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001909 struct hlist_node *n;
Herbert Xueb1d1642010-02-27 19:41:45 +00001910 u32 ver;
1911 int i;
1912
1913 del_timer_sync(&br->multicast_router_timer);
Linus Lüssing90010b32014-06-07 18:26:26 +02001914 del_timer_sync(&br->ip4_other_query.timer);
1915 del_timer_sync(&br->ip4_own_query.timer);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001916#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001917 del_timer_sync(&br->ip6_other_query.timer);
1918 del_timer_sync(&br->ip6_own_query.timer);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001919#endif
Herbert Xueb1d1642010-02-27 19:41:45 +00001920
1921 spin_lock_bh(&br->multicast_lock);
Eric Dumazete8051682010-11-15 06:38:10 +00001922 mdb = mlock_dereference(br->mdb, br);
Herbert Xueb1d1642010-02-27 19:41:45 +00001923 if (!mdb)
1924 goto out;
1925
1926 br->mdb = NULL;
1927
1928 ver = mdb->ver;
1929 for (i = 0; i < mdb->max; i++) {
Sasha Levinb67bfe02013-02-27 17:06:00 -08001930 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
Herbert Xueb1d1642010-02-27 19:41:45 +00001931 hlist[ver]) {
1932 del_timer(&mp->timer);
Herbert Xueb1d1642010-02-27 19:41:45 +00001933 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1934 }
1935 }
1936
1937 if (mdb->old) {
1938 spin_unlock_bh(&br->multicast_lock);
Herbert Xu10cc2b52010-03-05 21:03:35 +00001939 rcu_barrier_bh();
Herbert Xueb1d1642010-02-27 19:41:45 +00001940 spin_lock_bh(&br->multicast_lock);
1941 WARN_ON(mdb->old);
1942 }
1943
1944 mdb->old = mdb;
1945 call_rcu_bh(&mdb->rcu, br_mdb_free);
1946
1947out:
1948 spin_unlock_bh(&br->multicast_lock);
1949}
Herbert Xu0909e112010-02-27 19:41:49 +00001950
1951int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1952{
1953 int err = -ENOENT;
1954
1955 spin_lock_bh(&br->multicast_lock);
1956 if (!netif_running(br->dev))
1957 goto unlock;
1958
1959 switch (val) {
1960 case 0:
1961 case 2:
1962 del_timer(&br->multicast_router_timer);
1963 /* fall through */
1964 case 1:
1965 br->multicast_router = val;
1966 err = 0;
1967 break;
1968
1969 default:
1970 err = -EINVAL;
1971 break;
1972 }
1973
1974unlock:
1975 spin_unlock_bh(&br->multicast_lock);
1976
1977 return err;
1978}
1979
1980int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1981{
1982 struct net_bridge *br = p->br;
1983 int err = -ENOENT;
1984
1985 spin_lock(&br->multicast_lock);
1986 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1987 goto unlock;
1988
1989 switch (val) {
1990 case 0:
1991 case 1:
1992 case 2:
1993 p->multicast_router = val;
1994 err = 0;
1995
1996 if (val < 2 && !hlist_unhashed(&p->rlist))
1997 hlist_del_init_rcu(&p->rlist);
1998
1999 if (val == 1)
2000 break;
2001
2002 del_timer(&p->multicast_router_timer);
2003
2004 if (val == 0)
2005 break;
2006
2007 br_multicast_add_router(br, p);
2008 break;
2009
2010 default:
2011 err = -EINVAL;
2012 break;
2013 }
2014
2015unlock:
2016 spin_unlock(&br->multicast_lock);
2017
2018 return err;
2019}
Herbert Xu561f1102010-02-27 19:41:50 +00002020
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002021static void br_multicast_start_querier(struct net_bridge *br,
Linus Lüssing90010b32014-06-07 18:26:26 +02002022 struct bridge_mcast_own_query *query)
Herbert Xu561f1102010-02-27 19:41:50 +00002023{
2024 struct net_bridge_port *port;
Herbert Xu74857212012-04-13 02:37:42 +00002025
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002026 __br_multicast_open(br, query);
Herbert Xu74857212012-04-13 02:37:42 +00002027
2028 list_for_each_entry(port, &br->port_list, list) {
2029 if (port->state == BR_STATE_DISABLED ||
2030 port->state == BR_STATE_BLOCKING)
2031 continue;
2032
Linus Lüssing90010b32014-06-07 18:26:26 +02002033 if (query == &br->ip4_own_query)
2034 br_multicast_enable(&port->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002035#if IS_ENABLED(CONFIG_IPV6)
2036 else
Linus Lüssing90010b32014-06-07 18:26:26 +02002037 br_multicast_enable(&port->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002038#endif
Herbert Xu74857212012-04-13 02:37:42 +00002039 }
2040}
2041
2042int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2043{
Herbert Xu3a7fda02010-07-29 00:45:30 +00002044 int err = 0;
Eric Dumazete8051682010-11-15 06:38:10 +00002045 struct net_bridge_mdb_htable *mdb;
Herbert Xu561f1102010-02-27 19:41:50 +00002046
Andrey Vaginef5e0d82011-11-10 05:48:03 +00002047 spin_lock_bh(&br->multicast_lock);
Herbert Xu561f1102010-02-27 19:41:50 +00002048 if (br->multicast_disabled == !val)
2049 goto unlock;
2050
2051 br->multicast_disabled = !val;
2052 if (br->multicast_disabled)
2053 goto unlock;
2054
Herbert Xu3a7fda02010-07-29 00:45:30 +00002055 if (!netif_running(br->dev))
2056 goto unlock;
2057
Eric Dumazete8051682010-11-15 06:38:10 +00002058 mdb = mlock_dereference(br->mdb, br);
2059 if (mdb) {
2060 if (mdb->old) {
Herbert Xu561f1102010-02-27 19:41:50 +00002061 err = -EEXIST;
2062rollback:
2063 br->multicast_disabled = !!val;
2064 goto unlock;
2065 }
2066
Eric Dumazete8051682010-11-15 06:38:10 +00002067 err = br_mdb_rehash(&br->mdb, mdb->max,
Herbert Xu561f1102010-02-27 19:41:50 +00002068 br->hash_elasticity);
2069 if (err)
2070 goto rollback;
2071 }
2072
Linus Lüssing90010b32014-06-07 18:26:26 +02002073 br_multicast_start_querier(br, &br->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002074#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02002075 br_multicast_start_querier(br, &br->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002076#endif
Herbert Xu561f1102010-02-27 19:41:50 +00002077
2078unlock:
Andrey Vaginef5e0d82011-11-10 05:48:03 +00002079 spin_unlock_bh(&br->multicast_lock);
Herbert Xu561f1102010-02-27 19:41:50 +00002080
2081 return err;
2082}
Herbert Xub1951672010-02-27 19:41:51 +00002083
Herbert Xuc5c23262012-04-13 02:37:42 +00002084int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2085{
Linus Lüssingb00589a2013-08-01 01:06:20 +02002086 unsigned long max_delay;
2087
Herbert Xuc5c23262012-04-13 02:37:42 +00002088 val = !!val;
2089
2090 spin_lock_bh(&br->multicast_lock);
2091 if (br->multicast_querier == val)
2092 goto unlock;
2093
2094 br->multicast_querier = val;
Linus Lüssingb00589a2013-08-01 01:06:20 +02002095 if (!val)
2096 goto unlock;
2097
2098 max_delay = br->multicast_query_response_interval;
Linus Lüssingb00589a2013-08-01 01:06:20 +02002099
Linus Lüssing90010b32014-06-07 18:26:26 +02002100 if (!timer_pending(&br->ip4_other_query.timer))
2101 br->ip4_other_query.delay_time = jiffies + max_delay;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002102
Linus Lüssing90010b32014-06-07 18:26:26 +02002103 br_multicast_start_querier(br, &br->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002104
2105#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02002106 if (!timer_pending(&br->ip6_other_query.timer))
2107 br->ip6_other_query.delay_time = jiffies + max_delay;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002108
Linus Lüssing90010b32014-06-07 18:26:26 +02002109 br_multicast_start_querier(br, &br->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002110#endif
Herbert Xuc5c23262012-04-13 02:37:42 +00002111
2112unlock:
2113 spin_unlock_bh(&br->multicast_lock);
2114
2115 return 0;
2116}
2117
Herbert Xub1951672010-02-27 19:41:51 +00002118int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2119{
2120 int err = -ENOENT;
2121 u32 old;
Eric Dumazete8051682010-11-15 06:38:10 +00002122 struct net_bridge_mdb_htable *mdb;
Herbert Xub1951672010-02-27 19:41:51 +00002123
Curt Brunefe0d6922014-01-06 11:00:32 -08002124 spin_lock_bh(&br->multicast_lock);
Herbert Xub1951672010-02-27 19:41:51 +00002125 if (!netif_running(br->dev))
2126 goto unlock;
2127
2128 err = -EINVAL;
2129 if (!is_power_of_2(val))
2130 goto unlock;
Eric Dumazete8051682010-11-15 06:38:10 +00002131
2132 mdb = mlock_dereference(br->mdb, br);
2133 if (mdb && val < mdb->size)
Herbert Xub1951672010-02-27 19:41:51 +00002134 goto unlock;
2135
2136 err = 0;
2137
2138 old = br->hash_max;
2139 br->hash_max = val;
2140
Eric Dumazete8051682010-11-15 06:38:10 +00002141 if (mdb) {
2142 if (mdb->old) {
Herbert Xub1951672010-02-27 19:41:51 +00002143 err = -EEXIST;
2144rollback:
2145 br->hash_max = old;
2146 goto unlock;
2147 }
2148
2149 err = br_mdb_rehash(&br->mdb, br->hash_max,
2150 br->hash_elasticity);
2151 if (err)
2152 goto rollback;
2153 }
2154
2155unlock:
Curt Brunefe0d6922014-01-06 11:00:32 -08002156 spin_unlock_bh(&br->multicast_lock);
Herbert Xub1951672010-02-27 19:41:51 +00002157
2158 return err;
2159}
Linus Lüssing07f8ac42014-06-07 18:26:28 +02002160
2161/**
2162 * br_multicast_list_adjacent - Returns snooped multicast addresses
2163 * @dev: The bridge port adjacent to which to retrieve addresses
2164 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2165 *
2166 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2167 * snooping feature on all bridge ports of dev's bridge device, excluding
2168 * the addresses from dev itself.
2169 *
2170 * Returns the number of items added to br_ip_list.
2171 *
2172 * Notes:
2173 * - br_ip_list needs to be initialized by caller
2174 * - br_ip_list might contain duplicates in the end
2175 * (needs to be taken care of by caller)
2176 * - br_ip_list needs to be freed by caller
2177 */
2178int br_multicast_list_adjacent(struct net_device *dev,
2179 struct list_head *br_ip_list)
2180{
2181 struct net_bridge *br;
2182 struct net_bridge_port *port;
2183 struct net_bridge_port_group *group;
2184 struct br_ip_list *entry;
2185 int count = 0;
2186
2187 rcu_read_lock();
2188 if (!br_ip_list || !br_port_exists(dev))
2189 goto unlock;
2190
2191 port = br_port_get_rcu(dev);
2192 if (!port || !port->br)
2193 goto unlock;
2194
2195 br = port->br;
2196
2197 list_for_each_entry_rcu(port, &br->port_list, list) {
2198 if (!port->dev || port->dev == dev)
2199 continue;
2200
2201 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2202 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2203 if (!entry)
2204 goto unlock;
2205
2206 entry->addr = group->addr;
2207 list_add(&entry->list, br_ip_list);
2208 count++;
2209 }
2210 }
2211
2212unlock:
2213 rcu_read_unlock();
2214 return count;
2215}
2216EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
Linus Lüssing2cd41432014-06-07 18:26:29 +02002217
2218/**
Linus Lüssingc34963e2014-07-07 05:41:17 +02002219 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2220 * @dev: The bridge port providing the bridge on which to check for a querier
2221 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2222 *
2223 * Checks whether the given interface has a bridge on top and if so returns
2224 * true if a valid querier exists anywhere on the bridged link layer.
2225 * Otherwise returns false.
2226 */
2227bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2228{
2229 struct net_bridge *br;
2230 struct net_bridge_port *port;
2231 struct ethhdr eth;
2232 bool ret = false;
2233
2234 rcu_read_lock();
2235 if (!br_port_exists(dev))
2236 goto unlock;
2237
2238 port = br_port_get_rcu(dev);
2239 if (!port || !port->br)
2240 goto unlock;
2241
2242 br = port->br;
2243
2244 memset(&eth, 0, sizeof(eth));
2245 eth.h_proto = htons(proto);
2246
2247 ret = br_multicast_querier_exists(br, &eth);
2248
2249unlock:
2250 rcu_read_unlock();
2251 return ret;
2252}
2253EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2254
2255/**
Linus Lüssing2cd41432014-06-07 18:26:29 +02002256 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2257 * @dev: The bridge port adjacent to which to check for a querier
2258 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2259 *
2260 * Checks whether the given interface has a bridge on top and if so returns
2261 * true if a selected querier is behind one of the other ports of this
2262 * bridge. Otherwise returns false.
2263 */
2264bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2265{
2266 struct net_bridge *br;
2267 struct net_bridge_port *port;
2268 bool ret = false;
2269
2270 rcu_read_lock();
2271 if (!br_port_exists(dev))
2272 goto unlock;
2273
2274 port = br_port_get_rcu(dev);
2275 if (!port || !port->br)
2276 goto unlock;
2277
2278 br = port->br;
2279
2280 switch (proto) {
2281 case ETH_P_IP:
2282 if (!timer_pending(&br->ip4_other_query.timer) ||
2283 rcu_dereference(br->ip4_querier.port) == port)
2284 goto unlock;
2285 break;
Linus Lüssing3993c4e2014-06-12 01:41:24 +02002286#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing2cd41432014-06-07 18:26:29 +02002287 case ETH_P_IPV6:
2288 if (!timer_pending(&br->ip6_other_query.timer) ||
2289 rcu_dereference(br->ip6_querier.port) == port)
2290 goto unlock;
2291 break;
Linus Lüssing3993c4e2014-06-12 01:41:24 +02002292#endif
Linus Lüssing2cd41432014-06-07 18:26:29 +02002293 default:
2294 goto unlock;
2295 }
2296
2297 ret = true;
2298unlock:
2299 rcu_read_unlock();
2300 return ret;
2301}
2302EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);